<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>绑定样式</title>
    <script src="../js/vue.js"></script>
    <style>
        .basic {
            width: 400px;
            height: 100px;
            border: 1px solid black;
        }

        .happy {
            border: 4px solid red;
            background-color: rgba(255, 255, 0, 0.644);
            background: linear-gradient(30deg, yellow, pink, orange, yellow);
        }

        .sad {
            border: 4px dashed rgb(2, 197, 2);
            background-color: gray;
        }

        .normal {
            background-color: skyblue;
        }

        .atguigu1 {
            background-color: yellowgreen;
        }

        .atguigu2 {
            font-size: 30px;
            text-shadow: 2px 2px 10px red;
        }

        .atguigu3 {
            border-radius: 20px;
        }
    </style>
</head>

<body>
    <div id="root">
        <!-- 绑定class样式--字符串写法，适用于：样式的类名不确定，需要动态指定 -->
        <div class="basic" :class="mood" @click="changeMood">{{name}}</div><br><hr>
        <br>
        <!-- 绑定class样式--数组写法，适用于：要绑定的样式个数不确定，名字也不确定  -->
        <div class="basic" :class="classArr">{{name}}</div><br><hr>
        <br>
        <!-- 绑定class样式--对象学法，适用于：要绑定的样式个数确定、名字也确定，但要动态的决定用不用  -->
        <div class="basic" :class="classObj">{{name}}</div><br><hr>
        <br>
        <!-- 绑定style样式--对象写法 -->
        <div class="basic" :style="styleObj">{{name}}</div><br><hr>
        <br>
        <!-- 绑定style样式--数组写法 -->
        <div class="basic" :style="[styleObj,styleObj2]">{{name}}</div>
    </div>

</body>
<script>
    Vue.config.productionTip = false
    const vm = new Vue({
        el: '#root',
        data: {
            name: '尚硅谷',
            mood: 'normal',
            classArr: ['atguigu1', 'atguigu2', 'atguigu3'],
            classObj:{
                atguigui1 : false,
                atguigu2 : false,
                atguigu3 : false
            },
            styleObj:{
                fontSize:'40px',
                color:'red',
            },
            styleObj2:{
               backgroundColor:'#bfa'
            },

        },
        methods: {
            changeMood() {
                const arr = ['happy', 'sad', 'normal']
                const index = Math.floor(Math.random() * 3)
                this.mood = arr[index]
            }
        },
    })
</script>

</html>